removeisolatedsurf.m

function fnew = removeisolatedsurf(v, f, maxdiameter)
%
% fnew=removeisolatedsurf(v,f,maxdiameter)
%
% remove disjointed surface fragment filtered by using mesh diameter
%
% author: Qianqian Fang, <q.fang at neu.edu>
%
% input:
%    v: list of nodes of the input surface
%    f: list of triangles of the input surface
%    maxdiameter: maximum bounding box size for surface removal
%
% ouput:
%    fnew: new face list after removing the components smaller than
%          maxdiameter
%
% -- this function is part of iso2mesh toolbox (http://iso2mesh.sf.net)
%

fc = finddisconnsurf(f);
for i = 1:length(fc)
    xdia = v(fc{i}, 1);
    xdia = max(xdia(:)) - min(xdia(:));
    if (xdia <= maxdiameter)
        fc{i} = [];
        continue
    end
    ydia = v(fc{i}, 2);
    ydia = max(ydia(:)) - min(ydia(:));
    if (ydia <= maxdiameter)
        fc{i} = [];
        continue
    end
    zdia = v(fc{i}, 3);
    zdia = max(zdia(:)) - min(zdia(:));
    if (zdia <= maxdiameter)
        fc{i} = [];
        continue
    end
end
fnew = [];
for i = 1:length(fc)
    if (length(fc{i}))
        fnew = [fnew; fc{i}];
    end
end
if (size(fnew, 1) ~= size(f, 1))
    fprintf(1, 'removed %d elements of small isolated surfaces', size(f, 1) - size(fnew, 1));
end